The centered double decrease does not lean left or right and is perfectly centered. Slip 2 stitches together as if to knit, knit the next stitch, pass the slipped stitches over the stitch that was just knit

Left lifted (or raised) increase is performed on the knit side of St. st, and slants left. Knit the stitch that is just above the stitch that will be increased. Insert the left needle under the second knit stitch that is below the stitch that was just knit. Place this stitch onto the tip of the left needle and knit it through the back loop

Left lifted (or raised) increase is performed on the purl side of St. st, and slants left. Purl the stitch that is just above the stitch that will be increased. Insert the left needle under the second purl stitch that is below the stitch that was just purled. Place this stitch onto the tip of the left needle and purl it

Right lifted (or raised) increase performed on the knit side of St. st, and slants right. Insert the right needle under the stitch that is below the first stitch on the left needle. Place this stitch onto the tip of the left needle. Knit this stitch. Knit the next stitch that was above the stitch increased

Right lifted (or raised) increase performed on the purl side of St. st, and slants right. Insert the tip of the right needle under the leg of the purl stitch that is below the stitch that is on the left needle. Lift this stitch onto the tip of the left needle and purl it through the back loop. Purl the next stitch

Slants left. Slip, 1 st knitwise, slip the next st knitwise, insert the left needle into the fronts of these two sts and knit them together through the back loops using the right needle – 1 st decreased

Slants left. Slip1 st knitwise, slip the next st knitwise, slip the next st knitwise. Insert theneedle into the front of these sts and knit 3 stitches together through the back loops using the right needle – 2sts,decreased

Slants left. Slip 1 st as if to knit, slip a second stitch as if to knit. Move both sts back to the left needle (from tip to tip). Insert the right needle into the two stitches through their back loops, p2tog - 1 st decreased